US6041271A - Apparatus to determine the operational effectiveness of a machine tool and method therefor - Google Patents

Apparatus to determine the operational effectiveness of a machine tool and method therefor Download PDF

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Publication number
US6041271A
US6041271A US07/773,319 US77331991A US6041271A US 6041271 A US6041271 A US 6041271A US 77331991 A US77331991 A US 77331991A US 6041271 A US6041271 A US 6041271A
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United States
Prior art keywords
worksheet
opening
tool
hole
successive
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Expired - Fee Related
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US07/773,319
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English (en)
Inventor
Mikko Lindstrom
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Finn Power International Inc
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Finn Power International Inc
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Priority to US07/773,319 priority Critical patent/US6041271A/en
Assigned to FINN-POWER INTERNATIONAL, INC. reassignment FINN-POWER INTERNATIONAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LINDSTROM, MIKKO
Priority to EP92920878A priority patent/EP0607225B1/de
Priority to AT92920878T priority patent/ATE149675T1/de
Priority to ES92920878T priority patent/ES2098545T3/es
Priority to KR1019940701125A priority patent/KR100260583B1/ko
Priority to DK92920878.3T priority patent/DK0607225T3/da
Priority to CA002119878A priority patent/CA2119878C/en
Priority to JP5506918A priority patent/JPH07502932A/ja
Priority to PCT/US1992/007767 priority patent/WO1993007445A1/en
Priority to DE69217977T priority patent/DE69217977T2/de
Priority to FI941512A priority patent/FI111412B/fi
Publication of US6041271A publication Critical patent/US6041271A/en
Application granted granted Critical
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Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
    • G01B21/14—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters internal diameters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Program-control systems
    • G05B19/02—Program-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form
    • G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form characterised by monitoring or safety
    • G05B19/4065—Monitoring tool breakage, life or condition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/58—Investigating machinability by cutting tools; Investigating the cutting ability of tools

Definitions

  • the present invention is directed to sheet machining centers and more particularly to an apparatus and a method therefor to determine the poerational effectiveness of at least one cutting tool that may be associated with such a sheet machining center.
  • U.S. Pat. No. 4,420,685 discloses a system whereby a broken tool is detected by measuring the quantity of collected chips or particles resulting from the machining of a workpiece.
  • U.S. Pat. No. 4,918,616 discloses another system whereby a signal generating unit is mounted near the machine tool for generating a signal towards the machine tool.
  • An acoustic emission transducer also mounted near the machine tool, is driven by the signal from the signal generator so as to apply an artificial signal to the machine tool.
  • An acoustic signal generated from the machine tool in response to the artificial signal is then sensed and analyzed to determine if there is machine tool failure.
  • U.S. Pat. No. 4,228,514 discloses a tool wear system for determining the wear of a drill bit by means of its rotational speed.
  • U.S. Pat. No. 4,176,396 discloses yet another tool wear detection system which utilizes a sensor for producing an output signal that is representative of the cutting profile of the tool. Information relating to the cutting profile is stored in a data processing system when the tool was initially installed. Such information is then compared with updated cutting profile information to provide wear characteristics of the tool.
  • U.S. Pat. No. 3,841,149 Yet another tool wear detector system is disclosed in U.S. Pat. No. 3,841,149. There a reference value representing the broadband vibrational energy output from the tool in a relatively unworn condition is compared with the vibrational energy levels during successive and regular tool utilization intervals so that updated wear condition of the tool can be determined.
  • U.S. Pat. No. 3,694,637 also discloses a system for monitoring tool wear whereby Fourier analysis is used to transform a vibrational characteristic of the tool into a power frequency distribution to be compared with a reference spectrum obtained from a test tool. The analysis of the different spectra of the '637 patent is performed by a minicomputer while the vibrational characteristics from the machine tool drill is obtained by an accelerometer.
  • U.S. Pat. No. 4,031,368 discloses yet another system of determining the wear of a machine tool.
  • the '368 system utilizes different measured quantities such as the face wear, flank wear, and minor flank wear of the cutting tool, the dimension of the machined workpiece, its vibration, deflection and surface roughness etc. to calculate, via a controller, the predicted tool life of the machine tool.
  • three available methods of tool failure detection are discussed. They are: acoustic emission monitoring, cutting force measurement and power measurement.
  • the inventor has found that the safest and surest way of detecting a broken tool is to qualify the hole (or opening) made by the tool. Putting it simply, the inventor realizes the following three possible scenarios when a machine tool attempts to make a hole or an opening in a worksheet: (a) no hole or opening; (b) a damaged hole or opening; and (c) a perfect hole or opening. In the case where a perfect hole was made, obviously no action is required on the part of the operator of the system. However, such is not the case for (a) and (b) where there is either a hole missing or a poor quality hole made.
  • the inventor recognizes that by "looking at the hole", at any time during the operation of the machine work cycle, the effectiveness of a tool can be determined.
  • Such "look at the hole” method in effect provides great flexibility to the system since it can be effected remotely from where the actual physical punching or cutting of a hole takes place.
  • an apparatus remote from where the punching or cutting takes place i.e. remote from the machine tool, many different types of apparatus for determining the quality of the holes which are more reliable and less expensive than prior art systems can be utilized.
  • the inventor envisions a number of apparatus and methods therefor of effecting a system for qualifying a hole, if made, on a worksheet by a machine tool and correlating the quality of such hole to the operational effectiveness of the machine tool.
  • a photoelectric mechanism using a sensor for detecting holes made by a machine tool can be used.
  • Another practical example mechanism envisioned by the inventor includes the use of a camera for recording an image of the hole and comparing it with a prestored image of a hole made by a new machine tool, i.e. a perfect or desired hole.
  • Yet another mechanism envisioned by the inventor involves the use of a mechanical probe or a plurality of probing elements for physically measuring the presence of a hole and the quality of such.
  • a movable probe that records the coordinates it touches is also envisioned.
  • FIG. 1 is a side view of a representative sheet metal machining station to which the present invention is applicable;
  • FIG. 2 is a plan view of the FIG. 1 machining station
  • FIG. 3 is a simplified block schematic of an exemplar system of the present invention.
  • FIG. 4 is a plan view of a turret and the relative location of a first embodiment mechanism detector for the present invention
  • FIG. 5 is a side view of the first embodiment mechanism of the present invention.
  • FIG. 6A is the plan view of a second embodiment detection mechanism of the present invention.
  • FIG. 6B is a side view of the FIG. 6A embodiment.
  • FIG. 7A is a plan view of yet another embodiment detection mechanism of the present invention.
  • FIG. 7B is a side view of the FIG. 7A detection mechanism
  • FIG. 7C is a partial plan view of the magnetically conductive layers of the FIG. 7B detection mechanism
  • FIG. 8 is a simplified schematic block diagram of yet another system of the present invention.
  • FIG. 9 is a flow chart illustrating the operational steps of the present invention.
  • FIGS. 1 and 2 an automatic sheet metal machining center to which the system of the instant invention can be applied is shown in side view (FIG. 1) and plan view (FIG. 2).
  • a sheet metal machining center is shown, it should be noted that the system of the present invention is equally applicable to stand alone machines such as punchers, laser cutters and plasma cutters.
  • the machining center of FIGS. 1 and 2 can also contain machine tools such as a plasma cutter.
  • automatic sheet metal machining center 2 has a base frame 4 to which a top frame 6 is mounted. A worktable is indicated at 8 upon which a worksheet 10 is placed.
  • movably mounted to frame 4 is a first carriage 12 which is movable along the directions indicated by the Y arrows.
  • Movably mounted to carriage 12 is a second carriage 14 which is movable along first carriage 12 in the directions as indicated by the X arrows.
  • Two grippers 16 are shown to be connected to second carriage 14. As taught in U.S. Pat. No. 4,658,682, the disclosure of which being incorporated herein by reference, each gripper 16 has a pair of jaws 18 for grasping worksheet 10.
  • turret 20 is rotatably mounted to top frame 6 to which a number of tools, of which tools 22 and 24 are shown in FIGS. 1 and 2, are movably fitted.
  • turret 20 is rotatable along a center axis (CT in FIG. 4) such that each of the tools movably fitted near the periphery thereof can be positioned under a puncher at a location 26 for effecting a hole, or an opening, on worksheet 10.
  • CT in FIG. 4 a center axis
  • worksheet 10 can be moved anywhere on table 8 via a combination of movements by carriages 12 and 14.
  • a selected portion of worksheet 10 can be moved to location 26 under tool 24 so that the puncher can strike tool 24 for effecting a hole on worksheet 10.
  • CNC computerized numerical controller
  • holes or openings on worksheet 10 can also be effected by a laser cutter (or plasma cutter) whose cutting head is shown at 32.
  • the laser beam pathway which leads cutting head 32 to the laser generator (not shown) is designated 34.
  • laser cutter head 32 effects cutting on worksheet 10 by a combination of laser energy and oxygenated fluid.
  • a laser cutter does not need to work in conjunction with a turret punch press, as it may in actuality be a stand alone machine. So, too, the present invention is not limited to just a laser cutter, turret punch press or plasma cutter, as it is equally applicable to any machine tool that is capable of effecting an opening onto a worksheet. However, for the FIG. 2 machining center illustration, holes may be made onto worksheet 10 by both the turret punch press and laser cutter.
  • FIG. 3 a simplified combination of a block schematic and a side view of a worksheet resting on a worktable is shown.
  • the worksheet and the worktable being the same as those shown in FIGS. 1 and 2, are accordingly numbered the same.
  • a conventional sensor 36 is placed just beneath an opening 38 of worktable 8.
  • Sensor 36 may be any conventional sensor.
  • an electromagnetic wave emitting means such as a light source 42 may be placed proximate to opening 38 to illuminate the surroundings thereof.
  • sensor 36 may be used to sense opening 40 of worksheet 10.
  • One of which is the collective sensing of the light passing through hole 40 as an image.
  • Another is the sensing of the echo of the electromagnetic wave from source 42 reflected from the surrounding areas of opening 40 as an image.
  • Such images are fed by sensor 36 to a recorder 44.
  • Each of the thus recorded images is forwarded to a comparator 46 where it is compared with prestored data representing, for example, an image of a desired, or optimal, hole from a prestored data memory 48.
  • correlator 50 for correlation with the operational effectiveness of the machine tool which had effected hole 40 on worksheet 10.
  • the operation of correlator 50 is controlled by processor 52, which in the case of the sheet metal machining center shown in FIGS. 1 and 2, could be CNC 28.
  • the method in which hole 40 is discriminated by sensor 36 and compared with the prestored data from memory 48 is conventional and can be referenced to in U.S. Pat. No. 5,020,114 in which a two-dimensional image from an imaging unit is obtained by subtracting a background image prestored in a memory.
  • the '114 disclosure is incorporated to the disclosure of the present invention by reference herein.
  • a second optional emitting source 54 shown positioned adjacent to opening 38 of worktable 8, may be added to the FIG. 3 system.
  • the optional emitting source an electromagnetic wave which has a frequency different from that emitted from source 42 may be emitted towards hole 40.
  • the frequencies of the electromagnetic wave from light source 42 and that from source 54 are different, with the appropriate conventional sensor 36, the different electromagnetic waves are substracted from each other. And with the different electromagnetic waves being emitted at different angles, an accurate measurement of hole 40 can be obtained.
  • a method whereby two different electromagnetic waves may be combined for obtaining an accurate image is taught in U.S. Pat. No.
  • a reference sensor such as 56 could be used.
  • the purpose of reference sensor 56 is to compensate for any ambient light that may otherwise affect the sensed image.
  • a sensed image of hole 40 could be affected by ambient light.
  • an enhanced image of hole 40 is obtained.
  • FIGS. 4 and 5 A specific embodiment of sensor 36 is shown in FIGS. 4 and 5.
  • FIG. 4 there is shown the placement of a first embodiment detector with reference to turret 20 of the sheet metal machining center of FIG. 2.
  • turret 20 there are mounted at the periphery thereof a number of tool stations T1 to T20, each containing at least one tool for effecting a hole on worksheet 10.
  • CT The rotation center of turret of 20
  • CL center line of turret 20
  • sensor 36 is attached to a portion of base frame 4 by its base 66 via bolts 64.
  • a housing 68 Extending from sensor base 66 is a housing 68 the hollow top portion of which is fitted with detector 58, which is made by the Telemecanique Company of Riverside, Md. Housing 68 is fixed to base 66 by bolts 65.
  • the wiring for detector 56 in actuality extends into cavity 70 of housing 68.
  • a cap 72 is threadedly mated to the top portion of housing 68.
  • cap 72 has an opening 74 through which detector 58 senses light passing through hole 40 of worksheet 10.
  • an air passage 76 is provided from tip 68T of housing 68 to an input valve opening 78 at the mid-section of housing 68. With the appropriate air connection (not shown), air can be blown into valve opening 48, and along air passage 76, to force any dirt or debris out of opening 74.
  • detector 58 is the way it is mounted to housing 68 by threaded nut 80. By adjusting nut 80, the height of detector 58 can be adjusted to be either closer to or further away from hole 40 of worksheet 10.
  • cap 72 is also threadedly adjustable to accommodate any adjustment of detector 58.
  • the respective sizes of detector 58 and opening 74 are of course dependent on the envisioned size of hole 40. For example, if hole 40 is to made by a punch having a 3/8" diameter, then naturally detector 58 and opening 74 are configured accordingly so as to be able to sense the entire 3/8" opening of hole 40.
  • worksheet 10 can actually be operated on by the machine tool while a previously made hole, if any, and the quality of that previously made hole are sensed by detector 58 and defined accordingly.
  • the quality i.e. the definition of the hole, can be directly obtained from detector 58.
  • FIGS. 6A and 6B A mechanical embodiment equivalent of sensor 36 is shown in FIGS. 6A and 6B.
  • the mechanism shown in FIG. 6A and 6B comprises a plurality of concentric progressively smaller elongated elements 84-88 surrounding a center probe element 82.
  • the elements are provided within a housing 90 which may be attached to frame portion 4 by bolts (not shown).
  • the different elongated elements are insulated from each other, either by space or by an insulating material designated 92.
  • the elements are in turn fixed to a base 92, which may be driven longitudinally along the length of housing 90 by a driving mechanism 94.
  • a sensing mechanism 95 Residing in base 92, but which may also be residing elsewhere, is a sensing mechanism 95, which for example may include a potentiometer 95a to indicate the activation of the different ones of the elements 82-88. Potentiometer 95a has different portions thereof connected, via switches 97, by leads 96a-96d to elements 82-88, respectively. In place of a potentiometer, conventional different position indicating switches may also be used. Sensor mechanism 95 is connected by a lead 98 to a definition recorder 100. The definition recorder could of course be the same as recorder 44 shown in FIG. 3.
  • the sensor mechanism of FIGS. 6A and 6B operates as follows. Once worksheet 10 has been worked on, presumably having a hole made thereon by either a tool punch, a laser or plasma cutter, it is moved (either manually or by grippers when being machined in an automatic machining center) so that the selected portion where the hole should be is positioned above the FIG. 6A and 6B mechanism. As shown in FIG. 6B, once the worksheet has been so properly positioned, motor 94 is energized to drive the different elongated elements 82-88 upward towards worksheet 10. If there is no hole, then of course tip 82T of element 82 could not go past the plane where worksheet 10 lies. If there is indeed a hole, as for example hole 40 shown in FIG.
  • tip 82t of element 82 would pass into, and beyond, the plane of worksheet 10. This is indicated by the dotted line designated tip 82T.
  • tip 84T of element 84 would come into contact with the lower face of worksheet 10.
  • sensing mechanism 95 be it a potentiometer which senses a change of resistance or a position sensing switch which is turned on at that time.
  • definition recorder 100 When actuated, a signal is sent by sensing mechanism 95 to definition recorder 100 to indicate that hole 40 of worksheet 10 is larger than the diameter of elongated element 82 but less than the diameter of concentric element 84. Thus, definition recorder 100 now has a definition of hole 40.
  • the definition defined by the FIG. 6B mechanism depends on the number of elements it has, i.e. the greater the number of elements, the finer the definition. The definition thus obtained can then be compared with the prestored data representation of optimal holes, such as that shown in FIG. 3, to correlate the quality of the measured hole with the operational effectiveness of the machine tool.
  • FIGS. 7A and 7B Yet another embodiment mechanism of sensor 36 is shown in FIGS. 7A and 7B.
  • a plurality of elongated elements each substantially smaller than those shown in FIG. 6b, are aligned and held in a housing 102 attached, as was housing 90 in FIG. 6B, to a portion of frame 4.
  • the plurality of elements 104 represented in the cross-sectional FIG. 7B view as 104a to 1041, are held and aligned by two alignment disks 106 and 108.
  • Disk 108 in turn is made of two wired layers 108a and 108b.
  • Disks 106 and 108 are shown in the plan view in FIG. 7A where each disk has a plurality of holes corresponding to the number of elements 104.
  • each element 104 is fitted into one of the holes of disk 106 and a corresponding alignment hole in disk 108, and therefore layers 108a and 108b.
  • Each of elements 104 has at its lower portion thereof a magnetic material 110 of a given polarity.
  • Housing 102 has enclosed at its base portion 102b a magnetized material.
  • Enclosed material 112 may be turned into a magnet having a polarity reverse that of magnetic materials 110 by energizer 114. Once material 112 is energized to have a polarity opposite to that of the magnetic materials 110, elements 104 are repelled by material 112 in the direction of worksheet 10. The repulsion is such that that if there is indeed a hole 40 made in worksheet 10, magnetic materials 110 would pass half way through alignment disk layers 108a and 108b, as indicated at 110a of elements 104e-104i and the dotted portion which protrude pass the top of worksheet 10.
  • the remaining elements since the hole is of such dimension that only elements 104e-104i would pass therethrough, the remaining elements would come into contact with the lower face of worksheet 10. Accordingly, magnetic portions 110 of those elements do not come into the proximity of layers 108a and 108b.
  • each of the holes has connected thereto two wires (as for example 108al and 108bl for element 104k), one over the other, and orthogonal to each other. These wires are energized along different directions. Thus, the only time two wires will be energized at the same time is when the magnetic fields proximate to those wires are disrupted, as for example when the magnetic portion of any one of the elements 104 passes through the hole formed by layers 108a and 108b.
  • the quality of hole 40 can easily be defined, as for example by elements 104e to 104i at the cross section illustrated in FIG. 7B.
  • Such measured quality is transmitted to the definition recorder 100 by the signal(s) generated by layers 108a and 108b.
  • the plurality of wires of layer 108a extends in a direction going into the paper while the wires of layer 108b extend along the direction indicated by arrows 116. Accordingly, when magnetic elements 110 are positioned halfway between layers 108a and 108b, a pulse is registered only at the location on disk 108 where there is an intersection of wires perpendicular to each other. It is this intersection of wires which causes a pulse to be sent to definition recorder 100.
  • the quality of any holes made by a machine tool on worksheet 10 can be accurately defined.
  • the correlation of the quality of the hole made and the operational effectiveness of the machine tool used to make the hole can of course be correlated as was discussed above.
  • Another method in which the quality of a hole could be defined is by using a movable probe to touch different points of the opening and recording the coordinates thus probed.
  • a method of utilizing such probed coordinates to define the shape of a hole is disclosed in U.S. Pat. No. 5,016,199 incorporated by reference herein.
  • FIG. 8 Yet another embodiment of the system for defining the quality of any holes made by a machine tool and comparing the same with pre-recorded data in order to determine the operational effectiveness of a machine tool, i.e. whether the tool is broken or partially broken, is illustrated in FIG. 8.
  • the FIG. 8 embodiment similar to the embodiment shown in FIG. 3, includes a light source 42 for emitting a light toward the selected portion of worksheet 10 in order to illuminate the same.
  • a light source 42 for emitting a light toward the selected portion of worksheet 10 in order to illuminate the same.
  • an optical image sensor in the form of a camera or a scanner such as a charged coupled device 120 is used.
  • an image is made of the selected portion of worksheet 10 where hole 40 should be. If the recorded image indicates that there is no hole at the selected portion, it is determined that the machine tool is broken. In the case where a punch tool is being evaluated, it is clear that no hole is being punched by that punch tool.
  • the fact that no hole is formed implies that something is amiss with regard to either the laser beam or the plasma.
  • the operation of the machining center is stopped and the machine tool --be it a turret punch, laser or plasma cutter--is at least visually examined to determine whether the machine tool is indeed broken and requires replacement.
  • the recorded image does contain a hole, such recorded image is compared against the prestored data of an ideal image to evaluate the operational effectiveness, or condition, of the machine tool, per discussion on FIG. 3.
  • the system waits for a worksheet to be worked on. Once it has been worked on, the worksheet is moved into position, for example the selected portion thereof where the hole should be is moved from punch station 26 to sensor 36 in block 132. Thereafter, using any one of the above discussed mechanisms, the selected portion of worksheet 10 is inspected at block 134. Whether or not a hole is detected is determined in block 136. If there is indeed a hole detected, then the quality or definition of the hole is defined in block 138 per, for example, the methods disclosed by the various incorporated by reference disclosures.
  • the defined hole is compared with prestored data that is representative of a desired, or optimal hole at block 140.
  • the thus compared result is used to correlate the quality of the hole or opening made by the machine tool against the operational effectiveness of the machine tool, i.e. whether or not the machine tool is operating effectively, partially broken or broken. This is done in block 142. Whether or not the machine tool is operating at an acceptable operational effectiveness level is determined in block 144. If it is, then the system is returned to circle 130 to await the next to be inspected worksheet. It should be noted that instead of testing for each worksheet, the system can be programmed to only inspect the first few worksheets of a batch of worksheets.
  • the controller of the system would stop the machine and/or the machine tool operation at block 148.
  • the processor, or the controller, of the system would assume that the machine tool is broken, or partially broken or that some other problems are causing the machine tool to operate in a non-effective manner. This is done in block 146. With the assumption of block 146, the machine and/or machine tool operation are likewise stopped in block 148.
  • the machine tool is first inspected in block 150.
  • the determination of whether the machine tool is broken or requires replacement is done in decision block 152. If it is determined that replacement is required, such replacement is performed in block 154. Having thus replaced the broken machine tool, the controller would then return to circle 130 and await the next to be inspected worksheet. However, if the machine tool has been determined not to need replacement, then the system would look for other causes in block 156.

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  • General Health & Medical Sciences (AREA)
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  • Machine Tool Sensing Apparatuses (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Numerical Control (AREA)
  • Automatic Control Of Machine Tools (AREA)
  • Laser Beam Processing (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Punching Or Piercing (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US07/773,319 1991-10-10 1991-10-10 Apparatus to determine the operational effectiveness of a machine tool and method therefor Expired - Fee Related US6041271A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US07/773,319 US6041271A (en) 1991-10-10 1991-10-10 Apparatus to determine the operational effectiveness of a machine tool and method therefor
CA002119878A CA2119878C (en) 1991-10-10 1992-09-15 Apparatus to determine the operational effectiveness of a machine tool and method therefor
PCT/US1992/007767 WO1993007445A1 (en) 1991-10-10 1992-09-15 Apparatus to determine the operational effectiveness of a machine tool and method therefor
ES92920878T ES2098545T3 (es) 1991-10-10 1992-09-15 Aparato para determinar la eficacia de funcionamiento de una maquina herramienta.
KR1019940701125A KR100260583B1 (ko) 1991-10-10 1992-09-15 기계공구의 작동효율을 결정하기 위한 장치 및 방법
DK92920878.3T DK0607225T3 (da) 1991-10-10 1992-09-15 Apparat til bestemmelse af den operative effektivitet af et maskinværktøj og fremgangsmåde dertil.
EP92920878A EP0607225B1 (de) 1991-10-10 1992-09-15 Vorrichtung zur feststellung der wirksamkeit eines maschinenwerkzeugs
JP5506918A JPH07502932A (ja) 1991-10-10 1992-09-15 工作ツールの作動効果を判定する装置およびその方法
AT92920878T ATE149675T1 (de) 1991-10-10 1992-09-15 Vorrichtung zur feststellung der wirksamkeit eines maschinenwerkzeugs
DE69217977T DE69217977T2 (de) 1991-10-10 1992-09-15 Vorrichtung zur feststellung der wirksamkeit eines maschinenwerkzeugs
FI941512A FI111412B (fi) 1991-10-10 1994-03-31 Laitteisto ja menetelmä työstökoneen toiminnallisen tehokkuuden määrittämiseksi

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US07/773,319 US6041271A (en) 1991-10-10 1991-10-10 Apparatus to determine the operational effectiveness of a machine tool and method therefor

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EP (1) EP0607225B1 (de)
JP (1) JPH07502932A (de)
KR (1) KR100260583B1 (de)
AT (1) ATE149675T1 (de)
CA (1) CA2119878C (de)
DE (1) DE69217977T2 (de)
DK (1) DK0607225T3 (de)
ES (1) ES2098545T3 (de)
FI (1) FI111412B (de)
WO (1) WO1993007445A1 (de)

Cited By (17)

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US20050095070A1 (en) * 2003-10-31 2005-05-05 Doug Wysong Portable pneumatic blower
US20060251484A1 (en) * 2004-08-12 2006-11-09 Jun Yoshida Method for machining workpiece
US20080082200A1 (en) * 2006-09-29 2008-04-03 Matsushita Electric Works, Ltd. Device for estimating machining dimension of machine tool
US7424338B1 (en) * 2007-04-02 2008-09-09 Honda Motor Co., Ltd. Broken tool detection system
US20080226155A1 (en) * 2007-03-16 2008-09-18 Trumpf Werkzeugmashinen Gmbh + Co. Kg Sheet metal processing examination
US20090129882A1 (en) * 2007-11-15 2009-05-21 D4D Technologies, Llc Methods, Systems, and Devices for Monitoring Tools in a Dental Milling Machine
US20090178522A1 (en) * 2008-01-11 2009-07-16 Seiko Epson Corporation Method for manufacturing flexible substrate and flexible substrate punching device
CN101511531A (zh) * 2006-09-04 2009-08-19 罗伯特·博世有限公司 机床监测装置
US20100152882A1 (en) * 2006-09-04 2010-06-17 Reiner Krapf Machine tool monitoring device
US20110122243A1 (en) * 2008-05-14 2011-05-26 Robert Bosch Gmbh Image processing device for detecting contrast transition, particularly in a machine tool
CN104668312A (zh) * 2013-11-27 2015-06-03 通快机床两合公司 用于探测板形工件的整体尺寸的方法
US10754353B2 (en) * 2018-02-19 2020-08-25 Deere & Company Implement detection and control system
US20210229231A1 (en) * 2018-06-15 2021-07-29 Mitsubishi Electric Corporation Machine tool machining dimensions prediction device, machine tool equipment abnormality determination device, machine tool machining dimensions prediction system, and machine tool machining dimensions prediction method
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US20230150079A1 (en) * 2015-05-13 2023-05-18 Shaper Tools, Inc. Systems, methods and apparatus for guided tools
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IT202300027765A1 (it) * 2023-12-22 2025-06-22 Scm Group Spa Unità di taglio, macchina utensile e metodo di lavorazione di pannelli.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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DE102019122699B4 (de) * 2019-08-23 2025-01-16 Schuler Pressen Gmbh Umform- und/oder Trennvorrichtung und Verfahren zum Betreiben der Umform- und/oder Trennvorrichtung

Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636362A (en) * 1970-08-14 1972-01-18 James F Beeman Device for measuring hole sizes device for measuring hole sizes
US3694637A (en) * 1970-10-22 1972-09-26 Interactive Systems Method and apparatus for detecting tool wear
US3841149A (en) * 1973-01-08 1974-10-15 Interactive Systems Tool wear detector
US3902811A (en) * 1973-06-27 1975-09-02 Vsi Corp Electro-optical scanning system for dimensional gauging of parts
US4031368A (en) * 1972-04-17 1977-06-21 Verkstadsteknik Ab Adaptive control of cutting machining operations
US4176396A (en) * 1977-09-23 1979-11-27 The Charles Stark Draper Laboratory, Inc. Apparatus for directly measuring machine tool wear
US4181958A (en) * 1978-04-21 1980-01-01 The Valeron Corporation Multiple probe gage system
US4228514A (en) * 1979-04-16 1980-10-14 Bell Telephone Laboratories, Incorporated Method and system for determining the wear of a drill bit in real time
US4296474A (en) * 1977-09-06 1981-10-20 Deere & Company Inspection system and apparatus therefor
US4366543A (en) * 1979-05-05 1982-12-28 Goetze Ag Method and apparatus for the out-of-round shaping of workpieces
US4382215A (en) * 1981-07-16 1983-05-03 General Electric Company System and method of precision machining
US4412469A (en) * 1980-03-18 1983-11-01 Amada Company, Ltd. Turret punch presses having tool holders rotatably mounted in the turrets
US4420685A (en) * 1979-08-24 1983-12-13 Hitachi Seiko, Ltd. Method and equipment for detecting tool failure
US4538493A (en) * 1982-09-27 1985-09-03 Rainer S.R.L. Machine tool for working sheet metal
US4620281A (en) * 1981-09-22 1986-10-28 General Electric Company In-process cutting tool condition compensation and part inspection
US4648053A (en) * 1984-10-30 1987-03-03 Kollmorgen Technologies, Corp. High speed optical inspection system
US4657396A (en) * 1984-03-23 1987-04-14 Osaka Seimitsu Kikai Kabushiki Kaisha Optical method for detecting errors in shape
US4658688A (en) * 1985-09-13 1987-04-21 Strippit/Di-Acro - Houdaille, Inc. Rotary punch and die holders for turret punches
US4692690A (en) * 1983-12-26 1987-09-08 Hitachi, Ltd. Pattern detecting apparatus
US4711579A (en) * 1986-08-12 1987-12-08 H. Fred Johnston System for automatically inspecting a flat workpiece for holes
US4811253A (en) * 1985-03-30 1989-03-07 Ae Plc Method and apparatus for the measurement of airfoils
US4854161A (en) * 1988-06-28 1989-08-08 Innovex Inc. Method for diagnosing cutting tool dullness
US4881177A (en) * 1984-09-12 1989-11-14 Short Brothers Plc Ultrasonic scanning system
US4918616A (en) * 1984-05-18 1990-04-17 Omron Tateisi Electronics Co. Tool monitoring system
US5048385A (en) * 1989-12-28 1991-09-17 Strippit, Inc. Indexable multi-tool for punch press
US5059905A (en) * 1989-08-28 1991-10-22 Innovex Inc. Indication of cutting tool wear by monitoring eddy currents induced in a metallic workpiece
US5184217A (en) * 1990-08-02 1993-02-02 Doering John W System for automatically inspecting a flat sheet part
US5615471A (en) * 1993-12-24 1997-04-01 Rainer S.R.L. Machine for machining sheet metal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU438520A1 (ru) * 1973-01-12 1974-08-05 Таганрогский Комбайновый Завод Полуавтоматическа лини дл сверлени и нарезани резьбы
JPH0229469B2 (ja) * 1981-12-28 1990-06-29 Niigata Engineering Co Ltd Suchiseigyokosakukikainorenzokuntenhoho
JPH0829447B2 (ja) * 1986-08-25 1996-03-27 豊田工機株式会社 切削加工ユニツトにおける加工穴検査装置
JP2635766B2 (ja) * 1989-05-31 1997-07-30 株式会社東芝 板部材切断用数値制御プログラムの自動プログラミング装置および方法

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636362A (en) * 1970-08-14 1972-01-18 James F Beeman Device for measuring hole sizes device for measuring hole sizes
US3694637A (en) * 1970-10-22 1972-09-26 Interactive Systems Method and apparatus for detecting tool wear
US4031368A (en) * 1972-04-17 1977-06-21 Verkstadsteknik Ab Adaptive control of cutting machining operations
US3841149A (en) * 1973-01-08 1974-10-15 Interactive Systems Tool wear detector
US3902811A (en) * 1973-06-27 1975-09-02 Vsi Corp Electro-optical scanning system for dimensional gauging of parts
US4296474A (en) * 1977-09-06 1981-10-20 Deere & Company Inspection system and apparatus therefor
US4176396A (en) * 1977-09-23 1979-11-27 The Charles Stark Draper Laboratory, Inc. Apparatus for directly measuring machine tool wear
US4181958A (en) * 1978-04-21 1980-01-01 The Valeron Corporation Multiple probe gage system
US4228514A (en) * 1979-04-16 1980-10-14 Bell Telephone Laboratories, Incorporated Method and system for determining the wear of a drill bit in real time
US4366543A (en) * 1979-05-05 1982-12-28 Goetze Ag Method and apparatus for the out-of-round shaping of workpieces
US4420685A (en) * 1979-08-24 1983-12-13 Hitachi Seiko, Ltd. Method and equipment for detecting tool failure
US4412469A (en) * 1980-03-18 1983-11-01 Amada Company, Ltd. Turret punch presses having tool holders rotatably mounted in the turrets
US4382215A (en) * 1981-07-16 1983-05-03 General Electric Company System and method of precision machining
US4620281A (en) * 1981-09-22 1986-10-28 General Electric Company In-process cutting tool condition compensation and part inspection
US4538493A (en) * 1982-09-27 1985-09-03 Rainer S.R.L. Machine tool for working sheet metal
US4692690A (en) * 1983-12-26 1987-09-08 Hitachi, Ltd. Pattern detecting apparatus
US4657396A (en) * 1984-03-23 1987-04-14 Osaka Seimitsu Kikai Kabushiki Kaisha Optical method for detecting errors in shape
US4918616A (en) * 1984-05-18 1990-04-17 Omron Tateisi Electronics Co. Tool monitoring system
US4881177A (en) * 1984-09-12 1989-11-14 Short Brothers Plc Ultrasonic scanning system
US4648053A (en) * 1984-10-30 1987-03-03 Kollmorgen Technologies, Corp. High speed optical inspection system
US4811253A (en) * 1985-03-30 1989-03-07 Ae Plc Method and apparatus for the measurement of airfoils
US4658688A (en) * 1985-09-13 1987-04-21 Strippit/Di-Acro - Houdaille, Inc. Rotary punch and die holders for turret punches
US4711579A (en) * 1986-08-12 1987-12-08 H. Fred Johnston System for automatically inspecting a flat workpiece for holes
US4854161A (en) * 1988-06-28 1989-08-08 Innovex Inc. Method for diagnosing cutting tool dullness
US5059905A (en) * 1989-08-28 1991-10-22 Innovex Inc. Indication of cutting tool wear by monitoring eddy currents induced in a metallic workpiece
US5048385A (en) * 1989-12-28 1991-09-17 Strippit, Inc. Indexable multi-tool for punch press
US5184217A (en) * 1990-08-02 1993-02-02 Doering John W System for automatically inspecting a flat sheet part
US5615471A (en) * 1993-12-24 1997-04-01 Rainer S.R.L. Machine for machining sheet metal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Automatic Detection of Cutting Tool Failure", by Gee et al. presented at session 4C: Cutting Tool Control National Machine Tool Builders' Association 2nd Biennial International Tool Technical Conference, Sep. 5-13, 1984.
Automatic Detection of Cutting Tool Failure , by Gee et al. presented at session 4C: Cutting Tool Control National Machine Tool Builders Association 2nd Biennial International Tool Technical Conference, Sep. 5 13, 1984. *

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050095070A1 (en) * 2003-10-31 2005-05-05 Doug Wysong Portable pneumatic blower
US7125204B2 (en) 2003-10-31 2006-10-24 Finn Corporation Portable pneumatic blower
US20060251484A1 (en) * 2004-08-12 2006-11-09 Jun Yoshida Method for machining workpiece
US7331739B2 (en) * 2004-08-12 2008-02-19 Makino Milling Machine Co., Ltd. Method for machining workpiece
CN101511531A (zh) * 2006-09-04 2009-08-19 罗伯特·博世有限公司 机床监测装置
US20100152882A1 (en) * 2006-09-04 2010-06-17 Reiner Krapf Machine tool monitoring device
US8615320B2 (en) * 2006-09-04 2013-12-24 Robert Bosch Gmbh Machine tool monitoring device
US7778724B2 (en) * 2006-09-29 2010-08-17 Panasonic Electric Works Co., Ltd. Device for estimating machining dimension of machine tool
US20080082200A1 (en) * 2006-09-29 2008-04-03 Matsushita Electric Works, Ltd. Device for estimating machining dimension of machine tool
US20080226155A1 (en) * 2007-03-16 2008-09-18 Trumpf Werkzeugmashinen Gmbh + Co. Kg Sheet metal processing examination
US8098923B2 (en) * 2007-03-16 2012-01-17 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Sheet metal processing examination
US7424338B1 (en) * 2007-04-02 2008-09-09 Honda Motor Co., Ltd. Broken tool detection system
US20090129882A1 (en) * 2007-11-15 2009-05-21 D4D Technologies, Llc Methods, Systems, and Devices for Monitoring Tools in a Dental Milling Machine
US20090178522A1 (en) * 2008-01-11 2009-07-16 Seiko Epson Corporation Method for manufacturing flexible substrate and flexible substrate punching device
US8640582B2 (en) * 2008-01-11 2014-02-04 Seiko Epson Corporation Method for manufacturing flexible substrate and flexible substrate punching device
US20110122243A1 (en) * 2008-05-14 2011-05-26 Robert Bosch Gmbh Image processing device for detecting contrast transition, particularly in a machine tool
CN104668312A (zh) * 2013-11-27 2015-06-03 通快机床两合公司 用于探测板形工件的整体尺寸的方法
US20230150079A1 (en) * 2015-05-13 2023-05-18 Shaper Tools, Inc. Systems, methods and apparatus for guided tools
US11865659B2 (en) * 2015-05-13 2024-01-09 Shaper Tools, Inc. Systems, methods and apparatus for guided tools
US10754353B2 (en) * 2018-02-19 2020-08-25 Deere & Company Implement detection and control system
US20210229231A1 (en) * 2018-06-15 2021-07-29 Mitsubishi Electric Corporation Machine tool machining dimensions prediction device, machine tool equipment abnormality determination device, machine tool machining dimensions prediction system, and machine tool machining dimensions prediction method
US11826865B2 (en) * 2018-06-15 2023-11-28 Mitsubishi Electric Corporation Machine tool machining dimensions prediction device, machine tool equipment abnormality determination device, machine tool machining dimensions prediction system, and machine tool machining dimensions prediction method
US11314237B2 (en) * 2019-03-04 2022-04-26 Fanuc Corporation Managing apparatus and managing system
US12055911B2 (en) 2019-04-01 2024-08-06 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Method for offset measure compensation
IT202300027765A1 (it) * 2023-12-22 2025-06-22 Scm Group Spa Unità di taglio, macchina utensile e metodo di lavorazione di pannelli.
EP4574370A1 (de) * 2023-12-22 2025-06-25 SCM Group S.p.A. Schneidwerk, werkzeugmaschine und verfahren zur bearbeitung von platten

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EP0607225A1 (de) 1994-07-27
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EP0607225A4 (en) 1994-09-14
ES2098545T3 (es) 1997-05-01
JPH07502932A (ja) 1995-03-30
EP0607225B1 (de) 1997-03-05
WO1993007445A1 (en) 1993-04-15
FI941512A0 (fi) 1994-03-31
FI111412B (fi) 2003-07-15
DE69217977D1 (de) 1997-04-10
ATE149675T1 (de) 1997-03-15
CA2119878A1 (en) 1993-04-15

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